The structure of myoglobin is shown below. Myoglobin contains which of the following components? I. α-helices
II) β-pleated sheets
III) a prosthetic group
A) I only
B) II only
C) III only
D) I and II
E) I and III

Question

The structure of myoglobin is shown below. Myoglobin contains which of the following components?   I. α-helices
II) β-pleated sheets
III) a prosthetic group
A) I only 
B) II only 
C) III only 
D) I and II 
E) I and III

Quizplus · Accepted Answer

Myoglobin contains α-helices (I) and a prosthetic group (III). It does not contain β-pleated sheets (II). Therefore, the correct answer is E, which includes both I and III.

The Structure of Myoglobin Is Shown Below